Package com.hp.hpl.jena.sparql.core

Examples of com.hp.hpl.jena.sparql.core.Var

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    }

    @Override
    public void addBinding(Binding binding) {
        for (Iterator<Var> names = binding.vars(); names.hasNext();) {
            Var v = names.next() ;
            if ( !vars.contains(v) )
                vars.add(v) ;
        }
        rows.add(binding) ;
    }
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        ExprFunction2 eq = (ExprFunction2) e;
        Expr left = eq.getArg1();
        Expr right = eq.getArg2();

        Var var = null;
        NodeValue constant = null;

        if (left.isVariable() && right.isConstant()) {
            var = left.asVar();
            constant = right.getConstant();
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        if ( currentColumn >= variables.size() )
            // Exception will be thrown later when we have the complete row count.
            return ;
       
        Var v = variables.get(currentColumn) ;
        if ( n != null )
            currentValueRow().add(v, n) ;
       
    }
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                    Collection<Var> vars = this.projectVars;
                    query.setQueryResultStar(vars.isEmpty());   // SELECT * unless we are projecting
       
                    Iterator<Var> iter = vars.iterator();
                    for (; iter.hasNext();) {
                        Var var = iter.next();          
                        if (this.varExpression.containsKey(var))
                            query.addResultVar(var, this.varExpression.get(var));
                        else
                            query.addResultVar(var);
                    }
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            // Aggregators are broken up in the algebra, split between a
            // group and an assignment (extend or assign) using a generated var.
            // We record them here and insert later.
            for (ExprAggregator ea : a) {
                // Substitute generated var for actual
                Var givenVar = ea.getAggVar().asVar();
                // Copy aggregator across (?)
                Expr myAggr = query.allocAggregate(ea.getAggregator());
                varExpression.put(givenVar, myAggr);
            }
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    WhereClause();
    SolutionModifier();
  }

  final public void Project() throws ParseException {
                   Var v ; Expr expr ; Node n ;
    jj_consume_token(SELECT);
      getQuery().setQuerySelectType() ;
    switch ((jj_ntk==-1)?jj_ntk():jj_ntk) {
    case DISTINCT:
    case REDUCED:
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            // Old (ARQ 1) way - not recommended.
            return buildSyntax(input, nodeVar, pattern, execCxt) ;
       
        // Better
        // Build a SPARQL algebra expression
        Var var2 = createNewVar() ;                     // Hidden variable
       
        BasicPattern bp = new BasicPattern() ;
        Triple t = new Triple(nodeVar, RDFS.label.asNode(), var2) ;
        bp.add(t) ;
        OpBGP op = new OpBGP(bp) ;
       
        Expr regex = new E_Regex(new ExprVar(var2.getName()), pattern, "i") ;
        Op filter = OpFilter.filter(regex, op) ;

        // ---- Evaluation
        if ( true )
        {
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    // Build SPARQL syntax and compile it.
    // Not recommended.
    private QueryIterator buildSyntax(QueryIterator input, Node nodeVar, String pattern, ExecutionContext execCxt)
    {
        Var var2 = createNewVar() ;
        // Triple patterns for   ?x rdfs:label ?hiddenVar
        ElementTriplesBlock elementBGP = new ElementTriplesBlock();
        Triple t = new Triple(nodeVar, RDFS.label.asNode(), var2) ;
        elementBGP.addTriple(t) ;
       
        // Regular expression for  regex(?hiddenVar, "pattern", "i")
        Expr regex = new E_Regex(new ExprVar(var2.getName()), pattern, "i") ;
       
        ElementGroup elementGroup = new ElementGroup() ;
        elementGroup.addElement(elementBGP) ;
        elementGroup.addElement(new ElementFilter(regex)) ;
        // Compile it.
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        // Build pattern
       
        ElementGroup elg = new ElementGroup() ;
       
        Var varTitle = Var.alloc("title") ;
        Var varX = Var.alloc("x") ;
       
        Triple t1 = new Triple(varX, DC.title.asNode(),  varTitle) ;
        elg.addTriplePattern(t1) ;
       
        // Don't use bNodes for anon variables.  The conversion is done in parsing.
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{
    public static void main (String[] argv)
    {
        String BASE = "http://example/" ;
        BasicPattern bp = new BasicPattern() ;
        Var var_x = Var.alloc("x") ;
        Var var_z = Var.alloc("z") ;
       
        // ---- Build expression
        bp.add(new Triple(var_x, NodeFactory.createURI(BASE+"p"), var_z)) ;
        Op op = new OpBGP(bp) ;
        //Expr expr = ExprUtils.parse("?z < 2 ") ;
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Related Classes of com.hp.hpl.jena.sparql.core.Var

  • arq.examples.AlgebraExec
  • arq.examples.ExProg1
  • arq.examples.ExProg2
  • arq.examples.propertyfunction.labelSearch
  • com.clarkparsia.pellet.sparqldl.jena.SparqlDLResultSet
  • com.clarkparsia.pellet.sparqldl.jena.SparqlDLStage$PelletQueryIterator
  • com.clarkparsia.pellet.test.query.TestMiscSPARQL
  • com.hp.hpl.jena.graph.Node
  • com.hp.hpl.jena.sdb.compiler.TransformSDB
  • com.hp.hpl.jena.sdb.core.sqlnode.SqlSelectBlock
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